sql中怎么根据汉字的拼音首字母查询

--可用，速度可以
if   exists   (select   *   from   dbo.sysobjects   where   id   =   object_id(N'[dbo].[fGetPy]')   and   xtype   in   (N'FN',   N'IF',   N'TF'))
drop   function   [dbo].[fGetPy]
GO

--创建取拼音函数
create   function   fGetPy(@Str   varchar(500)='')
returns   varchar(500)
as
begin
declare   @strlen   int,@return   varchar(500),@ii   int
declare   @n   int,@c   char(1),@chn   nchar(1)

select   @strlen=len(@str),@return='',@ii=0
set   @ii=0
while   @ii <@strlen
begin
select   @ii=@ii+1,@n=63,@chn=substring(@str,@ii,1)
if   @chn>'z'
select   @n   =   @n   +1
,@c   =   case   chn   when   @chn   then   char(@n)   else   @c   end
from(
select   top   27   *   from   (
select   chn   =   '吖'
union   all   select   '八'
union   all   select   '嚓'
union   all   select   '咑'
union   all   select   '妸'
union   all   select   '发'
union   all   select   '旮'
union   all   select   '铪'
union   all   select   '丌' --because   have   no   'i'
union   all   select   '丌'
union   all   select   '咔'
union   all   select   '垃'
union   all   select   '嘸'
union   all   select   '拏'
union   all   select   '噢'
union   all   select   '妑'
union   all   select   '七'
union   all   select   '呥'
union   all   select   '仨'
union   all   select   '他'
union   all   select   '屲' --no   'u'
union   all   select   '屲' --no   'v'
union   all   select   '屲'
union   all   select   '夕'
union   all   select   '丫'
union   all   select   '帀'
union   all   select   @chn)   as   a
order   by   chn   COLLATE   Chinese_PRC_CI_AS
)   as   b
else   set   @c='a'
set   @return=@return+@c
end
return(@return)
end

go
--测试
select * from dbo.T_CITY_INFO where dbo.fGetPy(cy_name)='sh'

速度太慢
--2. 汉字首字母查询处理用户定义函数
CREATE FUNCTION f_GetPY(@str nvarchar(4000))
RETURNS nvarchar(4000)
AS
BEGIN
DECLARE @py TABLE(
ch char(1),
hz1 nchar(1) COLLATE Chinese_PRC_CS_AS_KS_WS,
hz2 nchar(1) COLLATE Chinese_PRC_CS_AS_KS_WS)
INSERT @py SELECT 'A',N'吖',N'鏊'
UNION  ALL SELECT 'B',N'八',N'簿'
UNION  ALL SELECT 'C',N'嚓',N'错'
UNION  ALL SELECT 'D',N'哒',N'跺'
UNION  ALL SELECT 'E',N'屙',N'贰'
UNION  ALL SELECT 'F',N'发',N'馥'
UNION  ALL SELECT 'G',N'旮',N'过'
UNION  ALL SELECT 'H',N'铪',N'蠖'
UNION  ALL SELECT 'J',N'丌',N'竣'
UNION  ALL SELECT 'K',N'咔',N'廓'
UNION  ALL SELECT 'L',N'垃',N'雒'
UNION  ALL SELECT 'M',N'妈',N'穆'
UNION  ALL SELECT 'N',N'拿',N'糯'
UNION  ALL SELECT 'O',N'噢',N'沤'
UNION  ALL SELECT 'P',N'趴',N'曝'
UNION  ALL SELECT 'Q',N'七',N'群'
UNION  ALL SELECT 'R',N'蚺',N'箬'
UNION  ALL SELECT 'S',N'仨',N'锁'
UNION  ALL SELECT 'T',N'他',N'箨'
UNION  ALL SELECT 'W',N'哇',N'鋈'
UNION  ALL SELECT 'X',N'夕',N'蕈'
UNION  ALL SELECT 'Y',N'丫',N'蕴'
UNION  ALL SELECT 'Z',N'匝',N'做'
DECLARE @i int
SET @i=PATINDEX('%[吖-做]%' COLLATE Chinese_PRC_CS_AS_KS_WS,@str)
WHILE @i>0
SELECT @str=REPLACE(@str,SUBSTRING(@str,@i,1),ch)
,@i=PATINDEX('%[吖-做]%' COLLATE Chinese_PRC_CS_AS_KS_WS,@str)
FROM @py
WHERE SUBSTRING(@str,@i,1) BETWEEN hz1 AND hz2
RETURN(@str)
END
GO